Big Fentanyl Bust at Southern Border:  A joint operation between the U.S. Border Patrol and the San Diego Sheriffs Department has resulted in the arrest of a Fullerton couple attempting to bring 44 1bs. of fentanyl into California Thursday.  Kristina Davis of the San Diego Union Tribune reports that the drug had an estimated street value of $1.5 million.  Drug traffickers now favor fentanyl, which is 50 times stronger than heroin, because it is cheap to produce and more easily smuggled.  The drug is primarily sourced from China and shipped to Mexico to be smuggled across the U.S. southern border.  Conservative estimates by DHS indicate that they catch roughly half of the illegal aliens and smugglers attempting to cross the border.